Improvement in dbill-jars



J. C. BASTMAN.

DRILL JAB..

Patented July'l, 1867.v

@uitrit flstrs @sind @fitta JAMES C. EASTMAN, 0F TITUSVILLE, PENNSYLVANIA. Letters Patent No. 66,816, dated July 16, 1867.

IMPROVEMENT IN DRILL-Jans'.

'ro ALL wHoM IT MAY eoNenRNs Be it known that I, JAMES C. EASTMAN, ofthe city of Titusville, county of Crawford, and State of Pennsylvania,rhavc invented a new and improved Method of Constructing Jars for use in drilling'oil-w'ells, die. and I dohcreby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings which-form a part ofl this specification, and in which similar letters represent similar parts in all the views. I

vice to perform, the sides or bars offthe links having to sustain great tensile strain, tending to tear them asunder, while the head of the link gives and receives a severe blow, tending to battez` or upsetthe same. At each Vstroke the jar Vmust liftV or jerk a set of tools weighing from five 'hundred to twelve hundred pounds, at the-rate'of from thirty to forty blows per minute, and when tools become fast in a. well it is frequently necessary to" jar them constantly for days and even weeks, while-the'breaking orcracking of a jar llink in a wellmay necessitate its abandonment. Theyare now constructed mostly or wholly of wrought iron,

and with continual rough usage, as in the case'ofjarring upon tools when fast in the well, the heads'of thejnrs soon become bruised orupset, and the links become locked together and inoperative. In this condition they canonly be got out by lowering and attaching another set o f tools and jars, which in turnare equally. liable to the same misfortune, and one ofthe very worst mishaps which a'wellnoperator has. to contend with is a, braken` or imperfect pair ofjars fast in the well. If constructed wholly or mostly of steelthey would be liable to break. at any moment. The object of my improvement, therefore, is to so combine iron and steel in manufacturing jars as Vto avail myself ofthe toughness, tenacity, and durability of wrought iron in those parts of thc jar subject'ed to tensile strain, and the hardness of steel in the parts which give and receive the blow, thus insuring greater durability with less risk of breakage orburring. I,

The accompanying drawings illustrate my invention, representing a pair of jars, and the portions of the same to which I apply the iron and steel.

Figure 1 is a sectional and side view of the `jars, with the collars or shoulders, and pins, to which the upper and lower bars of the tools are attached.

Figures 2 and 3 are sections taken on lines A B and C D. v v

a represen Ls the head or portion of the link which gives and receives the blows, and which I make of solid steel. In most cases I also face the inside or wearing edge of the link near the 'head with'steeLas indicated. The remaining parts ofthe link, including the bars b, the shank c, the collar d, the pin e, and the outer end of the jar-head f, all of which are subjected to a tensile strain, I make of the best of wrought iron. The steel head-piece a is thus embraced and held in placev by the wrought-iron `bars and head, to which it is properlyy welded, the end ofthe hcadf being of wrought iron, to give' additional strength and retain the st ccl in` place.

In manufacturing jars for drilling-tools the greatest care must be Vtaken that every partis swaged to n; uniform degree of hardness, to facilitate which each part should be made separately.

Figure 4 represents the detached pieces of the link as vfirst swaged out, previous4 to welding and finishing,

Figure 5 being a cross-section ou line E F.

Figure 6 represents a complete pair ofjars, as applied to a. set of drilling-tools.

The light tinlts represent-steel, and thedark tints wrought iron in all the drawings.

Having thus described my improvements, what I'elaim'las my invention, and vdesire to secure by Letters Patent, isi A pair of jars, applied to drilling-tools and cthersimilar uses, constructed of wrought iron and steel, combined and'applied substantially as represented, and for the objects herein set forth.

Dated at Titusville, Pennsylvania, this fourth day of March, A. D. 1867.

' J. C. EASTLIN.` Witnesses:

E.A AfS. ROBERTS,

Gao. W. ANGIER. 

